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Geography : some comments changed or added.

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avoid divide by zero and try to place the marker at the good position.


svn: r19839
This commit is contained in:
Serge Noiraud 2012-06-13 20:58:05 +00:00
parent 974312059f
commit 910e59fff3
1 changed files with 21 additions and 11 deletions
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32
src/plugins/lib/maps/markerlayer.py
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@ -94,7 +94,10 @@ class MarkerLayer(gobject.GObject, osmgpsmap.GpsMapLayer):
def add_marker(self, points, image, count):
"""
Add a track or life marker.
Add a marker.
Set minimum value, maximum value for the markers
Set the average value too.
We calculate that here, to minimize the overhead at markers drawing
"""
self.markers.append((points, image, count))
self.max_references += count
@ -107,12 +110,16 @@ class MarkerLayer(gobject.GObject, osmgpsmap.GpsMapLayer):
def do_draw(self, gpsmap, drawable):
"""
Draw all tracks or life markers.
Draw all markers here. Calculate where to draw the marker.
Depending of the average, minimum and maximum value, resize the marker.
We use cairo to resize the marker.
"""
ctx = drawable.cairo_create()
max_interval = self.max_value - self.nb_ref_by_places
min_interval = self.nb_ref_by_places - self.min_value
if min_interval == 0:
if max_interval == 0: # This to avoid divide by zero
max_interval = 0.01
if min_interval == 0: # This to avoid divide by zero
min_interval = 0.01
for marker in self.markers:
ctx.save()
@ -120,22 +127,25 @@ class MarkerLayer(gobject.GObject, osmgpsmap.GpsMapLayer):
size = 0.6
if float(marker[2]) > self.nb_ref_by_places:
# at maximum, we'll have an icon size = (0.6 + 0.3) * 48 = 43.2
size += ( 0.3 * ( ( float(marker[2]) - self.nb_ref_by_places )/ max_interval) )
size += (0.3 * ((float(marker[2]) - self.nb_ref_by_places)
/ max_interval) )
else:
# at minimum, we'll have an icon size = (0.6 - 0.3) * 48 = 14.4
size -= ( 0.3 * ( ( self.nb_ref_by_places - float(marker[2]) )/ min_interval) )
size -= (0.3 * ((self.nb_ref_by_places - float(marker[2]))
/ min_interval) )
conv_pt = osmgpsmap.point_new_degrees(float(marker[0][0]),
float(marker[0][1]))
coord_x, coord_y = gpsmap.convert_geographic_to_screen(conv_pt)
ctx.translate(coord_x, coord_y)
size = float(int(size * 10)/10.0)
ctx.scale( size, size)
# below, we must found one solution to place exactly the marker
# depending on its size. Normaly, the left top of the image is set to the coordinates
# The tip of the pin which should be at the marker position is at 3/18 of the width.
# rounding problem ?
posY = - (( 48 * size + 5 ) / ( 16.0 / 18.0 )) - 2
posX = - (( 48 * size + 5 ) / 6 ) - 2 # 6 <= 3/18 = 1/6
# below, we try to place exactly the marker depending on its size.
# Normaly, the left top corner of the image is set to the coordinates.
# The tip of the pin which should be at the marker position is at
# 3/18 of the width. So we shift the image position.
posY = - int( 48 * size + 0.5 ) - 10
posX = - int(( 48 * size ) / 6 + 0.5 ) - 8
ctx.set_source_pixbuf(marker[1], posX, posY)
ctx.paint()
ctx.restore()